summaryrefslogtreecommitdiff
path: root/drivers/video/gxt4500.c
blob: 135d78a0258860ae8a9640ed388f8f8f90f16d13 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
/*
 * Frame buffer device for IBM GXT4500P/6500P and GXT4000P/6000P
 * display adaptors
 *
 * Copyright (C) 2006 Paul Mackerras, IBM Corp. <paulus@samba.org>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fb.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/delay.h>
#include <linux/string.h>

#define PCI_DEVICE_ID_IBM_GXT4500P	0x21c
#define PCI_DEVICE_ID_IBM_GXT6500P	0x21b
#define PCI_DEVICE_ID_IBM_GXT4000P	0x16e
#define PCI_DEVICE_ID_IBM_GXT6000P	0x170

/* GXT4500P registers */

/* Registers in PCI config space */
#define CFG_ENDIAN0		0x40

/* Misc control/status registers */
#define STATUS			0x1000
#define CTRL_REG0		0x1004
#define   CR0_HALT_DMA			0x4
#define   CR0_RASTER_RESET		0x8
#define   CR0_GEOM_RESET		0x10
#define   CR0_MEM_CTRLER_RESET		0x20

/* Framebuffer control registers */
#define FB_AB_CTRL		0x1100
#define FB_CD_CTRL		0x1104
#define FB_WID_CTRL		0x1108
#define FB_Z_CTRL		0x110c
#define FB_VGA_CTRL		0x1110
#define REFRESH_AB_CTRL		0x1114
#define REFRESH_CD_CTRL		0x1118
#define FB_OVL_CTRL		0x111c
#define   FB_CTRL_TYPE			0x80000000
#define   FB_CTRL_WIDTH_MASK		0x007f0000
#define   FB_CTRL_WIDTH_SHIFT		16
#define   FB_CTRL_START_SEG_MASK	0x00003fff

#define REFRESH_START		0x1098
#define REFRESH_SIZE		0x109c

/* "Direct" framebuffer access registers */
#define DFA_FB_A		0x11e0
#define DFA_FB_B		0x11e4
#define DFA_FB_C		0x11e8
#define DFA_FB_D		0x11ec
#define   DFA_FB_ENABLE			0x80000000
#define   DFA_FB_BASE_MASK		0x03f00000
#define   DFA_FB_STRIDE_1k		0x00000000
#define   DFA_FB_STRIDE_2k		0x00000010
#define   DFA_FB_STRIDE_4k		0x00000020
#define   DFA_PIX_8BIT			0x00000000
#define   DFA_PIX_16BIT_565		0x00000001
#define   DFA_PIX_16BIT_1555		0x00000002
#define   DFA_PIX_24BIT			0x00000004
#define   DFA_PIX_32BIT			0x00000005

/* maps DFA_PIX_* to pixel size in bytes */
static const unsigned char pixsize[] = {
	1, 2, 2, 2, 4, 4
};

/* Display timing generator registers */
#define DTG_CONTROL		0x1900
#define   DTG_CTL_SCREEN_REFRESH	2
#define   DTG_CTL_ENABLE		1
#define DTG_HORIZ_EXTENT	0x1904
#define DTG_HORIZ_DISPLAY	0x1908
#define DTG_HSYNC_START		0x190c
#define DTG_HSYNC_END		0x1910
#define DTG_HSYNC_END_COMP	0x1914
#define DTG_VERT_EXTENT		0x1918
#define DTG_VERT_DISPLAY	0x191c
#define DTG_VSYNC_START		0x1920
#define DTG_VSYNC_END		0x1924
#define DTG_VERT_SHORT		0x1928

/* PLL/RAMDAC registers */
#define DISP_CTL		0x402c
#define   DISP_CTL_OFF			2
#define SYNC_CTL		0x4034
#define   SYNC_CTL_SYNC_ON_RGB		1
#define   SYNC_CTL_SYNC_OFF		2
#define   SYNC_CTL_HSYNC_INV		8
#define   SYNC_CTL_VSYNC_INV		0x10
#define   SYNC_CTL_HSYNC_OFF		0x20
#define   SYNC_CTL_VSYNC_OFF		0x40

#define PLL_M			0x4040
#define PLL_N			0x4044
#define PLL_POSTDIV		0x4048
#define PLL_C			0x404c

/* Hardware cursor */
#define CURSOR_X		0x4078
#define CURSOR_Y		0x407c
#define CURSOR_HOTSPOT		0x4080
#define CURSOR_MODE		0x4084
#define   CURSOR_MODE_OFF		0
#define   CURSOR_MODE_4BPP		1
#define CURSOR_PIXMAP		0x5000
#define CURSOR_CMAP		0x7400

/* Window attribute table */
#define WAT_FMT			0x4100
#define   WAT_FMT_24BIT			0
#define   WAT_FMT_16BIT_565		1
#define   WAT_FMT_16BIT_1555		2
#define   WAT_FMT_32BIT			3	/* 0 vs. 3 is a guess */
#define   WAT_FMT_8BIT_332		9
#define   WAT_FMT_8BIT			0xa
#define   WAT_FMT_NO_CMAP		4	/* ORd in to other values */
#define WAT_CMAP_OFFSET		0x4104		/* 4-bit value gets << 6 */
#define WAT_CTRL		0x4108
#define   WAT_CTRL_SEL_B		1	/* select B buffer if 1 */
#define   WAT_CTRL_NO_INC		2
#define WAT_GAMMA_CTRL		0x410c
#define   WAT_GAMMA_DISABLE		1	/* disables gamma cmap */
#define WAT_OVL_CTRL		0x430c		/* controls overlay */

/* Indexed by DFA_PIX_* values */
static const unsigned char watfmt[] = {
	WAT_FMT_8BIT, WAT_FMT_16BIT_565, WAT_FMT_16BIT_1555, 0,
	WAT_FMT_24BIT, WAT_FMT_32BIT
};

/* Colormap array; 1k entries of 4 bytes each */
#define CMAP			0x6000

#define readreg(par, reg)	readl((par)->regs + (reg))
#define writereg(par, reg, val)	writel((val), (par)->regs + (reg))

struct gxt4500_par {
	void __iomem *regs;

	int pixfmt;		/* pixel format, see DFA_PIX_* values */

	/* PLL parameters */
	int refclk_ps;		/* ref clock period in picoseconds */
	int pll_m;		/* ref clock divisor */
	int pll_n;		/* VCO divisor */
	int pll_pd1;		/* first post-divisor */
	int pll_pd2;		/* second post-divisor */

	u32 pseudo_palette[16];	/* used in color blits */
};

/* mode requested by user */
static char *mode_option;

/* default mode: 1280x1024 @ 60 Hz, 8 bpp */
static const struct fb_videomode defaultmode = {
	.refresh = 60,
	.xres = 1280,
	.yres = 1024,
	.pixclock = 9295,
	.left_margin = 248,
	.right_margin = 48,
	.upper_margin = 38,
	.lower_margin = 1,
	.hsync_len = 112,
	.vsync_len = 3,
	.vmode = FB_VMODE_NONINTERLACED
};

/* List of supported cards */
enum gxt_cards {
	GXT4500P,
	GXT6500P,
	GXT4000P,
	GXT6000P
};

/* Card-specific information */
static const struct cardinfo {
	int	refclk_ps;	/* period of PLL reference clock in ps */
	const char *cardname;
} cardinfo[] = {
	[GXT4500P] = { .refclk_ps = 9259, .cardname = "IBM GXT4500P" },
	[GXT6500P] = { .refclk_ps = 9259, .cardname = "IBM GXT6500P" },
	[GXT4000P] = { .refclk_ps = 40000, .cardname = "IBM GXT4000P" },
	[GXT6000P] = { .refclk_ps = 40000, .cardname = "IBM GXT6000P" },
};

/*
 * The refclk and VCO dividers appear to use a linear feedback shift
 * register, which gets reloaded when it reaches a terminal value, at
 * which point the divider output is toggled.  Thus one can obtain
 * whatever divisor is required by putting the appropriate value into
 * the reload register.  For a divisor of N, one puts the value from
 * the LFSR sequence that comes N-1 places before the terminal value
 * into the reload register.
 */

static const unsigned char mdivtab[] = {
/* 1 */		      0x3f, 0x00, 0x20, 0x10, 0x28, 0x14, 0x2a, 0x15, 0x0a,
/* 10 */	0x25, 0x32, 0x19, 0x0c, 0x26, 0x13, 0x09, 0x04, 0x22, 0x11,
/* 20 */	0x08, 0x24, 0x12, 0x29, 0x34, 0x1a, 0x2d, 0x36, 0x1b, 0x0d,
/* 30 */	0x06, 0x23, 0x31, 0x38, 0x1c, 0x2e, 0x17, 0x0b, 0x05, 0x02,
/* 40 */	0x21, 0x30, 0x18, 0x2c, 0x16, 0x2b, 0x35, 0x3a, 0x1d, 0x0e,
/* 50 */	0x27, 0x33, 0x39, 0x3c, 0x1e, 0x2f, 0x37, 0x3b, 0x3d, 0x3e,
/* 60 */	0x1f, 0x0f, 0x07, 0x03, 0x01,
};

static const unsigned char ndivtab[] = {
/* 2 */		            0x00, 0x80, 0xc0, 0xe0, 0xf0, 0x78, 0xbc, 0x5e,
/* 10 */	0x2f, 0x17, 0x0b, 0x85, 0xc2, 0xe1, 0x70, 0x38, 0x9c, 0x4e,
/* 20 */	0xa7, 0xd3, 0xe9, 0xf4, 0xfa, 0xfd, 0xfe, 0x7f, 0xbf, 0xdf,
/* 30 */	0xef, 0x77, 0x3b, 0x1d, 0x8e, 0xc7, 0xe3, 0x71, 0xb8, 0xdc,
/* 40 */	0x6e, 0xb7, 0x5b, 0x2d, 0x16, 0x8b, 0xc5, 0xe2, 0xf1, 0xf8,
/* 50 */	0xfc, 0x7e, 0x3f, 0x9f, 0xcf, 0x67, 0xb3, 0xd9, 0x6c, 0xb6,
/* 60 */	0xdb, 0x6d, 0x36, 0x9b, 0x4d, 0x26, 0x13, 0x89, 0xc4, 0x62,
/* 70 */	0xb1, 0xd8, 0xec, 0xf6, 0xfb, 0x7d, 0xbe, 0x5f, 0xaf, 0x57,
/* 80 */	0x2b, 0x95, 0x4a, 0x25, 0x92, 0x49, 0xa4, 0x52, 0x29, 0x94,
/* 90 */	0xca, 0x65, 0xb2, 0x59, 0x2c, 0x96, 0xcb, 0xe5, 0xf2, 0x79,
/* 100 */	0x3c, 0x1e, 0x0f, 0x07, 0x83, 0x41, 0x20, 0x90, 0x48, 0x24,
/* 110 */	0x12, 0x09, 0x84, 0x42, 0xa1, 0x50, 0x28, 0x14, 0x8a, 0x45,
/* 120 */	0xa2, 0xd1, 0xe8, 0x74, 0xba, 0xdd, 0xee, 0xf7, 0x7b, 0x3d,
/* 130 */	0x9e, 0x4f, 0x27, 0x93, 0xc9, 0xe4, 0x72, 0x39, 0x1c, 0x0e,
/* 140 */	0x87, 0xc3, 0x61, 0x30, 0x18, 0x8c, 0xc6, 0x63, 0x31, 0x98,
/* 150 */	0xcc, 0xe6, 0x73, 0xb9, 0x5c, 0x2e, 0x97, 0x4b, 0xa5, 0xd2,
/* 160 */	0x69,
};

static int calc_pll(int period_ps, struct gxt4500_par *par)
{
	int m, n, pdiv1, pdiv2, postdiv;
	int pll_period, best_error, t, intf;

	/* only deal with range 5MHz - 300MHz */
	if (period_ps < 3333 || period_ps > 200000)
		return -1;

	best_error = 1000000;
	for (pdiv1 = 1; pdiv1 <= 8; ++pdiv1) {
		for (pdiv2 = 1; pdiv2 <= pdiv1; ++pdiv2) {
			postdiv = pdiv1 * pdiv2;
			pll_period = DIV_ROUND_UP(period_ps, postdiv);
			/* keep pll in range 350..600 MHz */
			if (pll_period < 1666 || pll_period > 2857)
				continue;
			for (m = 1; m <= 64; ++m) {
				intf = m * par->refclk_ps;
				if (intf > 500000)
					break;
				n = intf * postdiv / period_ps;
				if (n < 3 || n > 160)
					continue;
				t = par->refclk_ps * m * postdiv / n;
				t -= period_ps;
				if (t >= 0 && t < best_error) {
					par->pll_m = m;
					par->pll_n = n;
					par->pll_pd1 = pdiv1;
					par->pll_pd2 = pdiv2;
					best_error = t;
				}
			}
		}
	}
	if (best_error == 1000000)
		return -1;
	return 0;
}

static int calc_pixclock(struct gxt4500_par *par)
{
	return par->refclk_ps * par->pll_m * par->pll_pd1 * par->pll_pd2
		/ par->pll_n;
}

static int gxt4500_var_to_par(struct fb_var_screeninfo *var,
			      struct gxt4500_par *par)
{
	if (var->xres + var->xoffset > var->xres_virtual ||
	    var->yres + var->yoffset > var->yres_virtual ||
	    var->xres_virtual > 4096)
		return -EINVAL;
	if ((var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
		return -EINVAL;

	if (calc_pll(var->pixclock, par) < 0)
		return -EINVAL;

	switch (var->bits_per_pixel) {
	case 32:
		if (var->transp.length)
			par->pixfmt = DFA_PIX_32BIT;
		else
			par->pixfmt = DFA_PIX_24BIT;
		break;
	case 24:
		par->pixfmt = DFA_PIX_24BIT;
		break;
	case 16:
		if (var->green.length == 5)
			par->pixfmt = DFA_PIX_16BIT_1555;
		else
			par->pixfmt = DFA_PIX_16BIT_565;
		break;
	case 8:
		par->pixfmt = DFA_PIX_8BIT;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static const struct fb_bitfield eightbits = {0, 8};
static const struct fb_bitfield nobits = {0, 0};

static void gxt4500_unpack_pixfmt(struct fb_var_screeninfo *var,
				  int pixfmt)
{
	var->bits_per_pixel = pixsize[pixfmt] * 8;
	var->red = eightbits;
	var->green = eightbits;
	var->blue = eightbits;
	var->transp = nobits;

	switch (pixfmt) {
	case DFA_PIX_16BIT_565:
		var->red.length = 5;
		var->green.length = 6;
		var->blue.length = 5;
		break;
	case DFA_PIX_16BIT_1555:
		var->red.length = 5;
		var->green.length = 5;
		var->blue.length = 5;
		var->transp.length = 1;
		break;
	case DFA_PIX_32BIT:
		var->transp.length = 8;
		break;
	}
	if (pixfmt != DFA_PIX_8BIT) {
		var->green.offset = var->red.length;
		var->blue.offset = var->green.offset + var->green.length;
		if (var->transp.length)
			var->transp.offset =
				var->blue.offset + var->blue.length;
	}
}

static int gxt4500_check_var(struct fb_var_screeninfo *var,
			     struct fb_info *info)
{
	struct gxt4500_par par;
	int err;

	par = *(struct gxt4500_par *)info->par;
	err = gxt4500_var_to_par(var, &par);
	if (!err) {
		var->pixclock = calc_pixclock(&par);
		gxt4500_unpack_pixfmt(var, par.pixfmt);
	}
	return err;
}

static int gxt4500_set_par(struct fb_info *info)
{
	struct gxt4500_par *par = info->par;
	struct fb_var_screeninfo *var = &info->var;
	int err;
	u32 ctrlreg, tmp;
	unsigned int dfa_ctl, pixfmt, stride;
	unsigned int wid_tiles, i;
	unsigned int prefetch_pix, htot;
	struct gxt4500_par save_par;

	save_par = *par;
	err = gxt4500_var_to_par(var, par);
	if (err) {
		*par = save_par;
		return err;
	}

	/* turn off DTG for now */
	ctrlreg = readreg(par, DTG_CONTROL);
	ctrlreg &= ~(DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH);
	writereg(par, DTG_CONTROL, ctrlreg);

	/* set PLL registers */
	tmp = readreg(par, PLL_C) & ~0x7f;
	if (par->pll_n < 38)
		tmp |= 0x29;
	if (par->pll_n < 69)
		tmp |= 0x35;
	else if (par->pll_n < 100)
		tmp |= 0x76;
	else
		tmp |= 0x7e;
	writereg(par, PLL_C, tmp);
	writereg(par, PLL_M, mdivtab[par->pll_m - 1]);
	writereg(par, PLL_N, ndivtab[par->pll_n - 2]);
	tmp = ((8 - par->pll_pd2) << 3) | (8 - par->pll_pd1);
	if (par->pll_pd1 == 8 || par->pll_pd2 == 8) {
		/* work around erratum */
		writereg(par, PLL_POSTDIV, tmp | 0x9);
		udelay(1);
	}
	writereg(par, PLL_POSTDIV, tmp);
	msleep(20);

	/* turn off hardware cursor */
	writereg(par, CURSOR_MODE, CURSOR_MODE_OFF);

	/* reset raster engine */
	writereg(par, CTRL_REG0, CR0_RASTER_RESET | (CR0_RASTER_RESET << 16));
	udelay(10);
	writereg(par, CTRL_REG0, CR0_RASTER_RESET << 16);

	/* set display timing generator registers */
	htot = var->xres + var->left_margin + var->right_margin +
		var->hsync_len;
	writereg(par, DTG_HORIZ_EXTENT, htot - 1);
	writereg(par, DTG_HORIZ_DISPLAY, var->xres - 1);
	writereg(par, DTG_HSYNC_START, var->xres + var->right_margin - 1);
	writereg(par, DTG_HSYNC_END,
		 var->xres + var->right_margin + var->hsync_len - 1);
	writereg(par, DTG_HSYNC_END_COMP,
		 var->xres + var->right_margin + var->hsync_len - 1);
	writereg(par, DTG_VERT_EXTENT,
		 var->yres + var->upper_margin + var->lower_margin +
		 var->vsync_len - 1);
	writereg(par, DTG_VERT_DISPLAY, var->yres - 1);
	writereg(par, DTG_VSYNC_START, var->yres + var->lower_margin - 1);
	writereg(par, DTG_VSYNC_END,
		 var->yres + var->lower_margin + var->vsync_len - 1);
	prefetch_pix = 3300000 / var->pixclock;
	if (prefetch_pix >= htot)
		prefetch_pix = htot - 1;
	writereg(par, DTG_VERT_SHORT, htot - prefetch_pix - 1);
	ctrlreg |= DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH;
	writereg(par, DTG_CONTROL, ctrlreg);

	/* calculate stride in DFA aperture */
	if (var->xres_virtual > 2048) {
		stride = 4096;
		dfa_ctl = DFA_FB_STRIDE_4k;
	} else if (var->xres_virtual > 1024) {
		stride = 2048;
		dfa_ctl = DFA_FB_STRIDE_2k;
	} else {
		stride = 1024;
		dfa_ctl = DFA_FB_STRIDE_1k;
	}

	/* Set up framebuffer definition */
	wid_tiles = (var->xres_virtual + 63) >> 6;

	/* XXX add proper FB allocation here someday */
	writereg(par, FB_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
	writereg(par, REFRESH_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
	writereg(par, FB_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
	writereg(par, REFRESH_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
	writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset);
	writereg(par, REFRESH_SIZE, (var->xres << 16) | var->yres);

	/* Set up framebuffer access by CPU */

	pixfmt = par->pixfmt;
	dfa_ctl |= DFA_FB_ENABLE | pixfmt;
	writereg(par, DFA_FB_A, dfa_ctl);

	/*
	 * Set up window attribute table.
	 * We set all WAT entries the same so it doesn't matter what the
	 * window ID (WID) plane contains.
	 */
	for (i = 0; i < 32; ++i) {
		writereg(par, WAT_FMT + (i << 4), watfmt[pixfmt]);
		writereg(par, WAT_CMAP_OFFSET + (i << 4), 0);
		writereg(par, WAT_CTRL + (i << 4), 0);
		writereg(par, WAT_GAMMA_CTRL + (i << 4), WAT_GAMMA_DISABLE);
	}

	/* Set sync polarity etc. */
	ctrlreg = readreg(par, SYNC_CTL) &
		~(SYNC_CTL_SYNC_ON_RGB | SYNC_CTL_HSYNC_INV |
		  SYNC_CTL_VSYNC_INV);
	if (var->sync & FB_SYNC_ON_GREEN)
		ctrlreg |= SYNC_CTL_SYNC_ON_RGB;
	if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
		ctrlreg |= SYNC_CTL_HSYNC_INV;
	if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
		ctrlreg |= SYNC_CTL_VSYNC_INV;
	writereg(par, SYNC_CTL, ctrlreg);

	info->fix.line_length = stride * pixsize[pixfmt];
	info->fix.visual = (pixfmt == DFA_PIX_8BIT)? FB_VISUAL_PSEUDOCOLOR:
		FB_VISUAL_DIRECTCOLOR;

	return 0;
}

static int gxt4500_setcolreg(unsigned int reg, unsigned int red,
			     unsigned int green, unsigned int blue,
			     unsigned int transp, struct fb_info *info)
{
	u32 cmap_entry;
	struct gxt4500_par *par = info->par;

	if (reg > 1023)
		return 1;
	cmap_entry = ((transp & 0xff00) << 16) | ((red & 0xff00) << 8) |
		(green & 0xff00) | (blue >> 8);
	writereg(par, CMAP + reg * 4, cmap_entry);

	if (reg < 16 && par->pixfmt != DFA_PIX_8BIT) {
		u32 *pal = info->pseudo_palette;
		u32 val = reg;
		switch (par->pixfmt) {
		case DFA_PIX_16BIT_565:
			val |= (reg << 11) | (reg << 6);
			break;
		case DFA_PIX_16BIT_1555:
			val |= (reg << 10) | (reg << 5);
			break;
		case DFA_PIX_32BIT:
			val |= (reg << 24);
			/* fall through */
		case DFA_PIX_24BIT:
			val |= (reg << 16) | (reg << 8);
			break;
		}
		pal[reg] = val;
	}

	return 0;
}

static int gxt4500_pan_display(struct fb_var_screeninfo *var,
			       struct fb_info *info)
{
	struct gxt4500_par *par = info->par;

	if (var->xoffset & 7)
		return -EINVAL;
	if (var->xoffset + info->var.xres > info->var.xres_virtual ||
	    var->yoffset + info->var.yres > info->var.yres_virtual)
		return -EINVAL;

	writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset);
	return 0;
}

static int gxt4500_blank(int blank, struct fb_info *info)
{
	struct gxt4500_par *par = info->par;
	int ctrl, dctl;

	ctrl = readreg(par, SYNC_CTL);
	ctrl &= ~(SYNC_CTL_SYNC_OFF | SYNC_CTL_HSYNC_OFF | SYNC_CTL_VSYNC_OFF);
	dctl = readreg(par, DISP_CTL);
	dctl |= DISP_CTL_OFF;
	switch (blank) {
	case FB_BLANK_UNBLANK:
		dctl &= ~DISP_CTL_OFF;
		break;
	case FB_BLANK_POWERDOWN:
		ctrl |= SYNC_CTL_SYNC_OFF;
		break;
	case FB_BLANK_HSYNC_SUSPEND:
		ctrl |= SYNC_CTL_HSYNC_OFF;
		break;
	case FB_BLANK_VSYNC_SUSPEND:
		ctrl |= SYNC_CTL_VSYNC_OFF;
		break;
	default: ;
	}
	writereg(par, SYNC_CTL, ctrl);
	writereg(par, DISP_CTL, dctl);

	return 0;
}

static const struct fb_fix_screeninfo gxt4500_fix = {
	.id = "IBM GXT4500P",
	.type = FB_TYPE_PACKED_PIXELS,
	.visual = FB_VISUAL_PSEUDOCOLOR,
	.xpanstep = 8,
	.ypanstep = 1,
	.mmio_len = 0x20000,
};

static struct fb_ops gxt4500_ops = {
	.owner = THIS_MODULE,
	.fb_check_var = gxt4500_check_var,
	.fb_set_par = gxt4500_set_par,
	.fb_setcolreg = gxt4500_setcolreg,
	.fb_pan_display = gxt4500_pan_display,
	.fb_blank = gxt4500_blank,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
};

/* PCI functions */
static int gxt4500_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	int err;
	unsigned long reg_phys, fb_phys;
	struct gxt4500_par *par;
	struct fb_info *info;
	struct fb_var_screeninfo var;
	enum gxt_cards cardtype;

	err = pci_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "gxt4500: cannot enable PCI device: %d\n",
			err);
		return err;
	}

	reg_phys = pci_resource_start(pdev, 0);
	if (!request_mem_region(reg_phys, pci_resource_len(pdev, 0),
				"gxt4500 regs")) {
		dev_err(&pdev->dev, "gxt4500: cannot get registers\n");
		goto err_nodev;
	}

	fb_phys = pci_resource_start(pdev, 1);
	if (!request_mem_region(fb_phys, pci_resource_len(pdev, 1),
				"gxt4500 FB")) {
		dev_err(&pdev->dev, "gxt4500: cannot get framebuffer\n");
		goto err_free_regs;
	}

	info = framebuffer_alloc(sizeof(struct gxt4500_par), &pdev->dev);
	if (!info) {
		dev_err(&pdev->dev, "gxt4500: cannot alloc FB info record\n");
		goto err_free_fb;
	}
	par = info->par;
	cardtype = ent->driver_data;
	par->refclk_ps = cardinfo[cardtype].refclk_ps;
	info->fix = gxt4500_fix;
	strlcpy(info->fix.id, cardinfo[cardtype].cardname,
		sizeof(info->fix.id));
	info->pseudo_palette = par->pseudo_palette;

	info->fix.mmio_start = reg_phys;
	par->regs = pci_ioremap_bar(pdev, 0);
	if (!par->regs) {
		dev_err(&pdev->dev, "gxt4500: cannot map registers\n");
		goto err_free_all;
	}

	info->fix.smem_start = fb_phys;
	info->fix.smem_len = pci_resource_len(pdev, 1);
	info->screen_base = pci_ioremap_bar(pdev, 1);
	if (!info->screen_base) {
		dev_err(&pdev->dev, "gxt4500: cannot map framebuffer\n");
		goto err_unmap_regs;
	}

	pci_set_drvdata(pdev, info);

	/* Set byte-swapping for DFA aperture for all pixel sizes */
	pci_write_config_dword(pdev, CFG_ENDIAN0, 0x333300);

	info->fbops = &gxt4500_ops;
	info->flags = FBINFO_FLAG_DEFAULT;

	err = fb_alloc_cmap(&info->cmap, 256, 0);
	if (err) {
		dev_err(&pdev->dev, "gxt4500: cannot allocate cmap\n");
		goto err_unmap_all;
	}

	gxt4500_blank(FB_BLANK_UNBLANK, info);

	if (!fb_find_mode(&var, info, mode_option, NULL, 0, &defaultmode, 8)) {
		dev_err(&pdev->dev, "gxt4500: cannot find valid video mode\n");
		goto err_free_cmap;
	}
	info->var = var;
	if (gxt4500_set_par(info)) {
		printk(KERN_ERR "gxt4500: cannot set video mode\n");
		goto err_free_cmap;
	}

	if (register_framebuffer(info) < 0) {
		dev_err(&pdev->dev, "gxt4500: cannot register framebuffer\n");
		goto err_free_cmap;
	}
	fb_info(info, "%s frame buffer device\n", info->fix.id);

	return 0;

 err_free_cmap:
	fb_dealloc_cmap(&info->cmap);
 err_unmap_all:
	iounmap(info->screen_base);
 err_unmap_regs:
	iounmap(par->regs);
 err_free_all:
	framebuffer_release(info);
 err_free_fb:
	release_mem_region(fb_phys, pci_resource_len(pdev, 1));
 err_free_regs:
	release_mem_region(reg_phys, pci_resource_len(pdev, 0));
 err_nodev:
	return -ENODEV;
}

static void gxt4500_remove(struct pci_dev *pdev)
{
	struct fb_info *info = pci_get_drvdata(pdev);
	struct gxt4500_par *par;

	if (!info)
		return;
	par = info->par;
	unregister_framebuffer(info);
	fb_dealloc_cmap(&info->cmap);
	iounmap(par->regs);
	iounmap(info->screen_base);
	release_mem_region(pci_resource_start(pdev, 0),
			   pci_resource_len(pdev, 0));
	release_mem_region(pci_resource_start(pdev, 1),
			   pci_resource_len(pdev, 1));
	framebuffer_release(info);
}

/* supported chipsets */
static const struct pci_device_id gxt4500_pci_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT4500P),
	  .driver_data = GXT4500P },
	{ PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT6500P),
	  .driver_data = GXT6500P },
	{ PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT4000P),
	  .driver_data = GXT4000P },
	{ PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT6000P),
	  .driver_data = GXT6000P },
	{ 0 }
};

MODULE_DEVICE_TABLE(pci, gxt4500_pci_tbl);

static struct pci_driver gxt4500_driver = {
	.name = "gxt4500",
	.id_table = gxt4500_pci_tbl,
	.probe = gxt4500_probe,
	.remove = gxt4500_remove,
};

static int gxt4500_init(void)
{
#ifndef MODULE
	if (fb_get_options("gxt4500", &mode_option))
		return -ENODEV;
#endif

	return pci_register_driver(&gxt4500_driver);
}
module_init(gxt4500_init);

static void __exit gxt4500_exit(void)
{
	pci_unregister_driver(&gxt4500_driver);
}
module_exit(gxt4500_exit);

MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
MODULE_DESCRIPTION("FBDev driver for IBM GXT4500P/6500P and GXT4000P/6000P");
MODULE_LICENSE("GPL");
module_param(mode_option, charp, 0);
MODULE_PARM_DESC(mode_option, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");